He is very fickle with his eating and food often just falls out of his mouth while he’s eating

He doesn’t like peeing in a litter tray. He prefers to go outside and will hold on all day if he has to. When he finally decides he’s going to pee in the tray, he tries to do it without actually standing in the tray.

He won’t poo in the litter tray, preferring to use a shower floor.

He gets confused with the back door and walks the wrong side of it

He gets scared of the door mat at the back door and often has to leap over it

That’s probably enough things for now… I then remembered I had a video of another odd thing: